Add functions to return library license and library configuration.

Originally committed as revision 20547 to svn://svn.ffmpeg.org/ffmpeg/trunk

libpostproc/postprocess.h

@@ -48,6 +48,16 @@
  */
 unsigned postproc_version(void);
 
+/**
+ * Returns the libpostproc build-time configuration.
+ */
+const char * postproc_configuration(void);
+
+/**
+ * Returns the libpostproc license.
+ */
+const char * postproc_license(void);
+
 #define PP_QUALITY_MAX 6
 
 #define QP_STORE_T int8_t